Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83a77e13ed7c622…

MALICIOUS

PDF

42.0 KB Created: 2020-04-17 23:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-07-24
MD5: 11ea92fe8f7b548db87cd9fbf049f53d SHA-1: 61cca0a912265effa6c78a50e04d43f3035706d8 SHA-256: a83a77e13ed7c622b567385b6574dcef818d6e6c5be554785f33d7e88acb0b16
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to 'Odia movie song mp4 2019' and embeds a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://comstar.pl/uploads/1/3/0/3/130313057/130313057.html#odia+movie+song+mp4++2019 PDF link annotation
    • http://tricitycreative.com/uploads/1/3/0/2/130272648/21cf9f7991b1.pdfIn PDF document text
    • http://smpleecleaning.com/uploads/1/3/1/3/131398234/1c7f36702ffb6eb.pdfIn PDF document text
    • http://vadervanodin.com/uploads/1/3/0/6/130620773/zinuwesatesamodiv.pdfIn PDF document text
    • http://housekeysproperties.com/uploads/1/3/0/6/130621853/6028750.pdfIn PDF document text
    • http://dananny.com/uploads/1/3/0/6/130604767/4487722.pdfIn PDF document text
    • http://greenwoodstem.com/uploads/1/3/0/9/130969580/lisagalajunimu.pdfIn PDF document text
    • http://ceotitanium.club/uploads/1/3/0/9/130969974/6135598.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000661a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x661A 9336 bytes
SHA-256: c3700fb4af91d92ecf7985b3e5b6853ae7424990a9c883f2a042a61b66bf904e
font_01_sfnt_off00008800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8800 6472 bytes
SHA-256: 3185a149154b42fc0f0995d8d75acfacb8881b89e376020fd42fc37495f8b4c8